Please don't house your ball pythons together.

The larger one will dominate the smaller one... It will LOOK like "cuddling" but it's dominance. It will stress out the smaller one and it will not eat.

Yes there is an issue of them trying to breed at too young an age which will be more of a problem for the female. She could easily become egg bound and die.

It's wonderful that you came here to ask first, instead of just sticking them together and waiting till a problem arose.